diff --git a/src/ui/DropShadow.cpp b/src/ui/DropShadow.cpp
new file mode 100644
index 00000000..d437975c
--- /dev/null
+++ b/src/ui/DropShadow.cpp
@@ -0,0 +1,108 @@
+#include "DropShadow.h"
+
+#include <QLinearGradient>
+#include <QPainter>
+
+void
+DropShadow::draw(QPainter &painter,
+ qint16 margin,
+ qreal radius,
+ QColor start,
+ QColor end,
+ qreal startPosition,
+ qreal endPosition0,
+ qreal endPosition1,
+ qreal width,
+ qreal height)
+{
+ painter.setPen(Qt::NoPen);
+
+ QLinearGradient gradient;
+ gradient.setColorAt(startPosition, start);
+ gradient.setColorAt(endPosition0, end);
+
+ // Right
+ QPointF right0(width - margin, height / 2);
+ QPointF right1(width, height / 2);
+ gradient.setStart(right0);
+ gradient.setFinalStop(right1);
+ painter.setBrush(QBrush(gradient));
+ // Deprecated in 5.13: painter.drawRoundRect(
+ // QRectF(QPointF(width - margin * radius, margin), QPointF(width, height -
+ // margin)), 0.0, 0.0);
+ painter.drawRoundedRect(
+ QRectF(QPointF(width - margin * radius, margin), QPointF(width, height - margin)),
+ 0.0,
+ 0.0);
+
+ // Left
+ QPointF left0(margin, height / 2);
+ QPointF left1(0, height / 2);
+ gradient.setStart(left0);
+ gradient.setFinalStop(left1);
+ painter.setBrush(QBrush(gradient));
+ painter.drawRoundedRect(
+ QRectF(QPointF(margin * radius, margin), QPointF(0, height - margin)), 0.0, 0.0);
+
+ // Top
+ QPointF top0(width / 2, margin);
+ QPointF top1(width / 2, 0);
+ gradient.setStart(top0);
+ gradient.setFinalStop(top1);
+ painter.setBrush(QBrush(gradient));
+ painter.drawRoundedRect(
+ QRectF(QPointF(width - margin, 0), QPointF(margin, margin)), 0.0, 0.0);
+
+ // Bottom
+ QPointF bottom0(width / 2, height - margin);
+ QPointF bottom1(width / 2, height);
+ gradient.setStart(bottom0);
+ gradient.setFinalStop(bottom1);
+ painter.setBrush(QBrush(gradient));
+ painter.drawRoundedRect(
+ QRectF(QPointF(margin, height - margin), QPointF(width - margin, height)), 0.0, 0.0);
+
+ // BottomRight
+ QPointF bottomright0(width - margin, height - margin);
+ QPointF bottomright1(width, height);
+ gradient.setStart(bottomright0);
+ gradient.setFinalStop(bottomright1);
+ gradient.setColorAt(endPosition1, end);
+ painter.setBrush(QBrush(gradient));
+ painter.drawRoundedRect(QRectF(bottomright0, bottomright1), 0.0, 0.0);
+
+ // BottomLeft
+ QPointF bottomleft0(margin, height - margin);
+ QPointF bottomleft1(0, height);
+ gradient.setStart(bottomleft0);
+ gradient.setFinalStop(bottomleft1);
+ gradient.setColorAt(endPosition1, end);
+ painter.setBrush(QBrush(gradient));
+ painter.drawRoundedRect(QRectF(bottomleft0, bottomleft1), 0.0, 0.0);
+
+ // TopLeft
+ QPointF topleft0(margin, margin);
+ QPointF topleft1(0, 0);
+ gradient.setStart(topleft0);
+ gradient.setFinalStop(topleft1);
+ gradient.setColorAt(endPosition1, end);
+ painter.setBrush(QBrush(gradient));
+ painter.drawRoundedRect(QRectF(topleft0, topleft1), 0.0, 0.0);
+
+ // TopRight
+ QPointF topright0(width - margin, margin);
+ QPointF topright1(width, 0);
+ gradient.setStart(topright0);
+ gradient.setFinalStop(topright1);
+ gradient.setColorAt(endPosition1, end);
+ painter.setBrush(QBrush(gradient));
+ painter.drawRoundedRect(QRectF(topright0, topright1), 0.0, 0.0);
+
+ // Widget
+ painter.setBrush(QBrush("#FFFFFF"));
+ painter.setRenderHint(QPainter::Antialiasing);
+ painter.drawRoundedRect(
+ QRectF(QPointF(margin, margin), QPointF(width - margin, height - margin)),
+ radius,
+ radius);
+}
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